Icelandic literature refers to Old West Norse literature written in Iceland by the Norwegian settlers, or literature written by these settlers outside of Iceland. It is best known for the sagas written in medieval times, starting in the 13th century. As Icelandic and Old Norse are almost the same, and because Icelandic works constitute most of Old Norse literature, Old Norse literature is often wrongly considered a subset of Icelandic literature. However, works by Norwegians are present in the standard reader Sýnisbók íslenzkra bókmennta til miðrar átjándu aldar, compiled by Sigurður Nordal on the grounds that the language was the same.